.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.4)}.modal-content{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);padding:20px;background-color:#fff;box-shadow:0 4px 8px rgba(0,0,0,.2)}.close-btn{color:#aaa;float:right;font-size:28px;cursor:pointer}.close-btn:hover{color:black}